Bone scan
Alternative names:
scan - bone
How the test is performed:
A tracer, or bone-seeking nuclide, is injected into a vein. The tracer emits gamma radiation, which is detected by the scanner. When the tracer has collected in the bones (about 2 to 4 hours) after the injection, the scan is performed. The distribution of gamma rays is recorded by the scanner, and the information is recorded in a computer. The image then appears on the computer screen. Normal or even distribution areas appear gray. "Hot spots" are areas where there is an increased absorption of the tracer; these appear dark. "Cold spots" are areas where there is less absorption of the tracer. These appear light. The scanning part of the test will last about 1 hour and may require moving to various positions.
How to prepare for the test:
You or a responsible family member must sign an informed consent form. You must remove jewelry, dentures, or other metal objects. You will wear a hospital gown.
Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:
How the test will feel:
There is a small amount of pain when the needle is inserted. Afterward, the injection site may be tender to the touch. During the scan there is no pain. You must remain still during the scan, and you will be instructed when to change positions.
Why the test is performed:
Detecting areas of abnormal bone metabolism is valuable in determining whether there are lesions, fractures, degenerative disorders, or cancer. This test can also help detect infection.
|
